Change in plasma HIV-1 RNA levels from baseline (Day 1-predose) on Day 11 with monotherapy [ Time Frame: Baseline (Day 1-predose) and Day 11 after the final dose with BMS-955176 ] [ Designated as safety issue: No ]

Secondary Outcome Measures:

Safety based on frequency of Adverse events (AEs), serious AEs, discontinuations due to AEs, findings of marked abnormalities in vital signs, clinical laboratory tests, ECG readings and physical examinations [ Time Frame: Up to day 24 (Groups 1-4, 8-10 and 13), up to day 28 (optional group 11) and up to day 42 (Part B) ] [ Designated as safety issue: Yes ]

Time course of the change from baseline in plasma log10 HIV-1 RNA levels and the time of maximum decrease during the 10-day monotherapy and combination therapy of BMS-955176 with Atazanavir (ATV) +/- Ritonavir (RTV) [ Time Frame: Day 1-24 (Groups 1-4, 8-10 & 13), Day 1-28 (optional group 11) and Day 1-42 (Part B) ] [ Designated as safety issue: No ]

Change from baseline in CD4+ and CD8+ lymphocyte counts and percentages following monotherapy and combination therapy of BMS-955176 with ATV +/- RTV in HIV-1 infected subjects [ Time Frame: Day 1-24 (Groups 1-4, 8-10 & 13), Day 1-28 (optional group 11) and Day 1-42 (Part B) ] [ Designated as safety issue: No ]

Maximum observed plasma concentration (Cmax) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Observed concentration at 24 hours postdose (C24) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Time of maximum observed plasma concentration (Tmax) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Trough observed plasma concentration (Ctrough) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Area under the concentration-time curve in one dosing interval [AUC(TAU)] of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Accumulation Index (AI), calculated as ratio of AUC(TAU) at steady state to AUC(TAU) after the first dose of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Apparent total body clearance (CLT/F) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Terminal Plasma half-life (T-Half)-after last dose only of BMS-955176 [ Time Frame: Day 10 (Part A and C), Day 14 (optional group 11) and Day 28 (Part B) ] [ Designated as safety issue: No ]

Degree of Fluctuation (DF), calculated as steady state (Cmax-C24) / (AUC(TAU) / 24) of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Average steady-state plasma concentration (Css-av), calculated as AUC(TAU) / TAU of BMS-955176 [ Time Frame: 26 timepoints up to Day 10 (Groups 1-4, 8-10 & 13), 30 timepoints up to Day 14 (optional group 11) and 24 timepoints up to Day 28 (Part B) ] [ Designated as safety issue: No ]

Women of childbearing potential (WOCBP) must not be pregnant and nursing

BMI: 18.0-35.0 kg/m2

Subjects are infected with HIV-1 (clades B or C) and meet following criteria at the screening:

i) Plasma HIV-1 RNA ≥5,000 copies/mL; ii) Antiretroviral treatment naive (defined as <1 week of ARV treatment) or ART-experienced (protease inhibitor and/or maturation inhibitor naive); iii) Subjects are not eligible for HIV-1 treatment based on the United States Department of Health and Human Services Panel on Antiretroviral Guidelines for Adults and Adolescents or have declined initiation of cART iv) CD4+ lymphocyte measurement ≥200 cells/μL; v) In Parts A and B, all subjects are infected with HIV-1 clade B vi) In Part C, all subjects are infected with HIV-1 clade C

A personal history of clinically relevant cardiac disease, symptomatic or asymptomatic arrhythmias, syncopal episodes, or additional risk factors for torsades de pointes. A personal or family history of long QT syndrome

Patients who are unwilling to practice adequate infection protection during and after study participation to minimize potential for spread of HIV infection, including HIV which may have developed resistance to HIV maturation inhibitor and/or ATV

Any gastrointestinal surgery that could impact upon the absorption of study drug

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01803074